Java — 140 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Java code through the act MCP server. 140 operations available: 66 refactor, 18 query, 42 analysis, 14 verification. Each operation is callable from Claude Code, Cursor, Codex, OpenCode, or any MCP-compatible agent host. Click any operation for a stable anchor link suitable for citation.

18Query
66Refactor
42Analysis
14Verify

Query

18 query tools, the same on every supported language. Descriptions live in the shared reference: /docs/query-tools.

callers control_flow data_flow definition diagnostics effect_closure effect_summary fix_auto get_type graph import_organize interface mutations references repo_outline skeleton symbols symbols_batch

Refactor

Operation Description
add-explicit-type Replace a `var` local declaration with its inferred explicit type
add-final-modifier Add final modifier for immutability
add-interface-implementation Add interface implementation to a class
add-null-check Wrap expression in null-check guard
add-parameter-from-field Add a method parameter sourced from a field
add-static-modifier Add static modifier when applicable
add-visibility-modifier Add explicit public/private/protected modifier
change-method-signature Modify a method's parameter list or return type
change-signature Modify function parameters, return, generics
convert-anonymous-class-to-lambda Convert single-method anonymous class to lambda
convert-anonymous-to-class Extract an anonymous class into a named top-level or nested class
convert-enhanced-for Convert traditional for to enhanced for loop
convert-if-to-ternary Convert if-else to ternary operator
convert-string-concat-to-builder Convert string concatenation in loops to StringBuilder
convert-to-builder Generate a Builder pattern for a class
convert-to-enum Convert a class with constant fields to an enum
convert-to-lambda Convert anonymous inner class to lambda
convert-to-object-initializer Replace constructor chaining with an object initializer block
decrease-visibility Decrease visibility for encapsulation
encapsulate Make field private, generate getter/setter
encapsulate-field Make a field private and generate getter/setter
expand-visibility Widen the visibility modifier of a declaration
extract-class Extract methods/fields to new class
extract-constant Extract value to named constant
extract-interface Extract method signatures into new interface
extract-superclass Pull common members into a new superclass
extract-variable Extract expression into new local variable
extract_function Extract a code selection into a new function — automatically infers parameters, return types, and inserts the call site. Use instead of manually cutting/pasting code. Works without LSP; LSP improves type inference. Params: file (string), new_name (string), start_line (u32), start_column (u32), end_line (u32), end_column (u32) [, preview (bool), receipt (bool)]
extract_variable Extract an expression into a named variable — inserts the declaration and replaces the expression with the variable name. Works without LSP. Params: file (string), new_name (string), start_line (u32), start_column (u32), end_line (u32), end_column (u32) [, preview (bool)]
generate-constructor Create constructor with field initialization
generate-equals-method Generate equals() and hashCode() implementation
generate-getter Create getter method for field
generate-getters-setters Create both getter and setter for field
generate-implementation Create class implementing interface
generate-javadoc Create javadoc comment block
generate-override-annotation Add @Override annotation to overridden methods
generate-setter Create setter method for field
generate-tostring-method Create toString() implementation
generify-variable Replace a raw type variable with a generic type parameter
increase-visibility Increase visibility when needed
inline Inline a variable, function, or method — replace every usage with its definition body, then remove the original. The inverse of extract. Works without LSP (single-file); LSP enables cross-file inlining. Params: file (string), symbol (string) [, line (u32), preview (bool), receipt (bool)]
inline-variable Replace variable with its assignment
insert_body Replace a function's implementation body with new code. AST-validated — rejects if the result has parse errors, so you can't accidentally break syntax. Use instead of manual text editing for function rewrites. Params: file (string), symbol (string), code (string) [, commit (bool)]
introduce-interface Extract a new interface from an existing class
introduce-method Wrap statements into new method
introduce-parameter Convert local variable to method parameter
introduce-variable Extract an expression into a named local variable
merge-variable-declaration Merge a variable declaration and its first assignment into one statement
move-method-up Move a method to the superclass
move_symbol Move a function, class, or type to a different file and automatically update all imports across the codebase. Use instead of manually cut/paste + fixing imports. Works without LSP (single-file); LSP enables cross-file import updates. Params: file (string), symbol (string), destination (string) [, preview (bool), receipt (bool)]
organize-imports Sort and deduplicate import statements
pull-up-method Pull a method from a subclass into the superclass hierarchy
push-down-method Move a method from a superclass down to subclasses
recipe_run Run a codemod recipe: declarative match → transform → optional verify across modeled grammars. Preview lists matches; apply writes with optional E7 receipts and all-or-nothing rollback. Returns a per-site report.
remove-redundant-cast Delete unnecessary type cast
remove-redundant-modifiers Delete modifiers that are implied by context
remove-unused-field Delete field that is never read
remove-unused-import Delete unused import statement
remove-unused-method Delete method that is never called
rename Rename a symbol and automatically update ALL references across the codebase. Safer and faster than find-and-replace — AST-aware, won't rename strings or comments. Works without LSP (single-file); LSP enables cross-file renames. Params: file (string), old_name (string), new_name (string) [, line (u32), column (u32), preview (bool), receipt (bool)]
rename Rename symbol and all references
reorder-parameters Change the order of method parameters
simplify-field-initialization Move a field initializer from the constructor into the field declaration
simplify-lambda Convert a verbose lambda to a method reference where possible
split-variable-declaration Split a combined variable declaration and assignment into separate statements
wrap-method-body Wrap a method body in a try/catch, synchronized, or other block

Analysis

42 analysis tools, the same on every supported language. Descriptions live in the shared reference: /docs/analysis-tools.

analyze_api_diff analyze_chokepoints analyze_clones analyze_clusters analyze_cohesion analyze_conformance analyze_coupling analyze_cycle_risk analyze_cycles analyze_dead_code analyze_depth analyze_entry_points analyze_export analyze_extraction analyze_fan_balance analyze_features analyze_hotspots analyze_impact analyze_inconsistencies analyze_inheritance analyze_interface_bloat analyze_interfaces analyze_layers analyze_orphan_types analyze_patterns analyze_platform_deps analyze_readiness analyze_roles analyze_seams analyze_stability analyze_surface analyze_test_gaps analyze_thickness analyze_type_completeness churn_hotspots co_change_clusters coverage_overlay ownership_map profile_overlay simulate split_module trace_overlay

Verify

14 verify tools, the same on every supported language. Descriptions live in the shared reference: /docs/verification.

bisect_regression gate generate_test_harness scan secret_surface summarize_pr taint_flow unsafe_surface verify_behavioral_equivalence verify_contract_preserved verify_diff_semantics verify_port_parity verify_side_effects verify_test_impact

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